It's the Geeky equivalent of a conversation that most guys would have about a Maxim girl versus the Olsen twins. Would you rather have a single, very fast CPU or a pair of somewhat slower processors? That's a tough question, and it's precisely the one that Intel has prompted by releasing a couple of new CPUs today, the Pentium D 820 and the Pentium 4 670. The P4 670 is the fastest single Pentium 4 processor ever released, running at nearly 4GHz. The Pentium D 820, meanwhile, runs a full gigahertz slower, but it has two complete Pentium 4-style CPU cores onboard for a very nice price. Which is better? Well, that depends on a great many things. Let's have a look at some of them.